SB2026040970 - Fedora 42 update for nix
Published: April 9, 2026
Security Bulletin ID
SB2026040970
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) UNIX Symbolic Link (Symlink) Following (CVE-ID: CVE-2026-39860)
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to unix symbolic link following in fixed-output derivation output registration when copying temporary fixed-output derivation outputs from the build chroot. A remote attacker can create a symlink at the temporary output path to overwrite arbitrary writable files and escalate privileges.
This affects sandboxed Linux builds, while sandboxed macOS builds are unaffected.
Remediation
Install update from vendor's website.